Wearable Pressure Sensors with Capacitive Response over a Wide Dynamic Range

Chen, Qianling; Yang, Jing; Chen, Bin; Feng, Jiansong; Xiao, Songhua; Yue, Quan; Zhang, Xu; Wang, Taihong

2022-09-01

10.1021/acsami.2c10555

ACS Applied Materials & Interfaces   Impact Factor & Quartile

1944-8244

1944-8252

At present, there are mainly two types of capacitive pressure sensors based on ordinary capacitance and electrical double layer (EDL) capacitance. However, few researchers have combined these two types of capacitors in pressure sensing to improve the dynamic range of a sensor under pressure. Here, we fabricated a capacitive pressure sensor with an asymmetric structure based on poly(vinylidene fluoride-co-hexafluoropropylene) using a simple electro-spinning process. A layer of mixed ionic nanofiber membrane and a layer of pure nanofiber membrane were stacked and used as the dielectric layer of the sensor. Due to the porous structure and non-stickiness of the pure nanofiber membrane, it can be penetrated by the mixed ionic nanofiber membrane under pressure, realizing the reversible conversion from ordinary capacitance to EDL capacitance, thereby achieving a great change in the capacitance value. The sensitivities of the sensor are 55.66 and 24.72 kPa(-1) in the pressure ranges of 0-31.11 and 31.11-66.67 kPa, respectively, with good cycle stability, fast loading-unloading response time, and an ultra-low pressure detection limit as low as 0.087 Pa. Finally, this sensor was used for the detection of human physiological signals, and the sensor would have potential applications in the fields of human tactile sensing systems, bionic robots, and wearable devices.

capacitive sensor pressure detection electrostatic spinning wearable devices nanofiber membrane

SCI

English

First ; Corresponding

Guangdong Major Scientific Research Project[2018KZDXM061]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000862271200001

AMER CHEMICAL SOC

Web of Science

Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China

Chen, Qianling,Yang, Jing,Chen, Bin,et al. Wearable Pressure Sensors with Capacitive Response over a Wide Dynamic Range[J]. ACS Applied Materials & Interfaces,2022.

Chen, Qianling.,Yang, Jing.,Chen, Bin.,Feng, Jiansong.,Xiao, Songhua.,...&Wang, Taihong.(2022).Wearable Pressure Sensors with Capacitive Response over a Wide Dynamic Range.ACS Applied Materials & Interfaces.

Chen, Qianling,et al."Wearable Pressure Sensors with Capacitive Response over a Wide Dynamic Range".ACS Applied Materials & Interfaces (2022).